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The Compact Fluorescent Lamps (CFLs) are widely adopted in residential and commercial sector. This adoption is proposed following the energy conservation and environmental protection efforts. Despite, the CFLs consume low power, many users using these loads can cause a harmonic impact depending of the Attenuation-Amplification Effect. For instance, if this Effect is neglected (e.g., using Harmonic...
The impacts of distributed generation (DG) units on the unbalanced three-phase power systems are analyzed. Line loss mathematic model caused by harmonic with unbalanced three-phase loads is proposed through theoretical derivation. The corresponding simulation model based on typical 10kV medium voltage microgrid is established with Matlab/Simulink. The simulation results show that an optimal grid connection...
This paper presents the design, implementation and validation of a low coast computational tool, capable of reproducing harmonic signals extracted from a distribution system simulation in real-time. The proposed methodology allows to simulate in real time, signals distorted by harmonics of different frequencies (up to the 15th harmonic). After the design and implementation of this interface, a correct...
This paper presents the performance of SSSC for power quality improvement. As nonlinear loads causes the harmonics in the system and therefore the power quality gets reduce because of these non linear load. Hence power quality is study with case I. Non linear load without SSSC & case II. Non linear load with SSSC in IEEE 9 bus system. The diode bridge rectifier is used here as non linear load...
The low voltage power grids usually include neutral wire for load balancing. If currents spectra contain third harmonics then the neutral current can rise to extremely high values. Normal magnitude could be exceeded almost twice. Such kind of overload may lead to reduction of cable lifetime due to insulation aging. The paper goal is to obtain a criterion for choosing compensating devices that based...
Electric Vehicle Charging Systems (EVCS) are gaining popularity in many countries, such as the UK, due to the rise in the number of electric vehicles and their potential impact on LV distribution networks. Consequently, there will be high growth in consumer demand for electrical power and such loads are non-linear in nature. In modern LV distribution networks, at the 11kV voltage level for example,...
The United States Navy's future fleet of vessels will deploy an increasing number of high power electrical loads that will operate in a transient nature. As the electrical requirements increase, the efficiency of power conversion will become more important than ever before. Converting AC power to DC power can be very inefficient due to the generation of harmonics that are injected into the power system...
Active power filtering is one of the most promising and mature technologies used for eradication of harmonics in power systems. This paper presents the implementation and simulation of shunt active power filter with diode rectifier connected to RL Load. Generation of reference fundamental load current signal is done without calculating load active power. The simulation results are analyzed and THD-I...
The aim of this paper is to present the approach of emission levels assessment in the power supply of industrial plant, including data mining and simplified rules for summation of harmonic voltages as described in internal Czech electrical plant power systems standards for distribution network operators. Besides to quality of supply voltages in the point of common coupling, and internal points of...
Solar sources require using power converters introducing harmonics in the output waveforms. Data used is the solar radiation and temperature in Halifax, Nova Scotia, Canada. In this work we studied the effect of changing the blanking angle of the square-wave inverter with 60Hz switching. The harmonics are evaluated for various temperatures and solar radiation for the optimum firing angle. Also probability...
Due to the wide spread of power electronics equipment in modern electrical systems, the increase of the harmonics disturbance in the ac mains currents has became a major concern due to the adverse effects on all equipment. This paper presents the analysis and simulation using Matlab/ Simulink of a three-phase four wire neutral clamped active power filter (APF) compensating the harmonics and reactive...
Harmonic distortion on voltages and currents increases with the increased penetration of Plug-in Electric Vehicle (PEV) loads in distribution systems. Wind Generators (WGs), which are source of harmonic currents, have some common harmonic profiles with PEVs. Thus, WGs can be utilized to subside the effect of PEVs on harmonic distortion. This paper studies the impact of PEVs on harmonic distortions...
Objective of research is to analyze the influence of the photovoltaic (PV) generator installation to power quality on distribution network. There are two models of load distribution network, namely industrial and residential costumers distribution network. Reseach show that the value of bus voltage THD on distribution network of industrial and residential customers are still under of voltage THD limit...
This paper presents a case study carried out on an existing 11 kV distribution network concerning the influence of different types of nonlinear loads namely switch mode power supply (SMPS), arc lighting (AL) and thyristor controlled reactor (TCR). The study also examines the effectiveness of mitigation to minimize the effect of harmonics by connecting a zigzag transformer into the system. The modeling...
Share of current harmonics, which is taken from the power net, increases with the use of diode and thyristor rectifiers (so-called characteristic harmonics of current). One of the ways to minimize these harmonics is to use the active rectifier. The principle of operation of active rectifier is based on correct switching of transistors, which allows the two basic functions: a) to keep the first harmonic...
Z-Source inverter for buck-boost energy conversion is implemented using only passive elements with no additional active elements. Therefore Z-Source inverter is less complex. From prospects of Z-Source inverter, an Embedded EZ-Source inverter that can produce the same gain as Z-Source inverter is introduced. This paper contributes the digital simulation of renewable energy source controlled EZ-Source...
Multi-Level Selective Harmonic Elimination (MSHE) offers tight control over the harmonic content of a multi-level inverter output signal. By employing Fourier series analysis and setting the appropriate initial conditions, a non-linear transcendental equation set is constructed. By turning inverter's power switches on and off at exact instances defined by equation set solution, fundamental component...
DC side voltage is a very important parameter in the design of parallel active power filter (PAPF), but so far, very little discussion was conducted on it in a quantitative manner by previous publications. In this paper, an extensive analysis on the DC side voltage to the performance of PAPF with SVM control is made, and a specification of the DC side voltage rated values with different compensation...
Multi-pulses rectifiers are one of the technical solutions for harmonic mitigation in AC adjustable speed drives. 12-pulse, 18-pulse and 24-pulse rectifier topologies are used in various technical applications. The paper presents results from experimental measurements and results from simulations for two topologies of the eighteen-pulse rectifiers: with Dy1z1+200z1-200 and with Dd0diii0+200diii0-20...
Growing numbers of consumers distort AC networks with harmonics. Therefore suppression of the network pollution should be considered. This problem can be solved by using "network-friendly" converters. In this article some consumers are presented that pollute the single-phase AC networks with harmonics. Therefore the network voltage waveform will be distorted. In our study we examine the...
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